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  • someacnt@sh.itjust.workstoScience Memes@mander.xyz•*Permanently Deleted*
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    6 months ago

    I am not a topologist, but I can try…

    A space (shape) is contractible if you can “contract” (shrink) it to a point without cutting, pinching or punching through holes. For example, a mattress is contractible, since you can shrink it to the center - each point can follow the line to the center, continuously. Meanwhile, a doughnut, a circle or a hollow sphere are not contractible, you can never remove the inner “hole” to shrink to a point without cutting.

    In general, any dimensional sphere is not contractible… Until it is - infinite dimensional sphere is contractible. Somehow, it loses the “hollow space” inside.